12. How does John Muir's spirit still have an effect on life today in 2021?
A. The warnings of global warming are at the forefront of the Sierra Club.
B. Yosemite Valley was discovered by John Muir.
C. The Sierra Club was established and is still running today to protect the
Sierra region.
D. Theodore Rossevelt became President in 1901, with the help of Muir.

C. The Sierra Club was established and is still running today to protect the Sierra region.

Explanation:

John Muir was a famous environmentalist in the late 1800s and the early 1900s who fought for the protection of the U.S. mountains, rivers, and generally the U.S. wilderness.

He founded the Sierra Club which has continued his legacy and continues to take care of various wilderness areas in the United States including in Sierra where it lobbies government whenever a perceived threat is noticed.

we need to see the statements.